/*
 * =============================================================================
 * 
 *   Copyright (c) 2011-2016, The THYMELEAF team (http://www.thymeleaf.org)
 * 
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 * 
 *       http://www.apache.org/licenses/LICENSE-2.0
 * 
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 * 
 * =============================================================================
 */
package com.abcijkxyz.dialects.stsm.score;

import org.thymeleaf.IEngineConfiguration;
import org.thymeleaf.context.ITemplateContext;
import org.thymeleaf.engine.AttributeName;
import org.thymeleaf.model.IProcessableElementTag;
import org.thymeleaf.processor.element.AbstractAttributeTagProcessor;
import org.thymeleaf.processor.element.IElementTagStructureHandler;
import org.thymeleaf.standard.expression.IStandardExpression;
import org.thymeleaf.standard.expression.IStandardExpressionParser;
import org.thymeleaf.standard.expression.StandardExpressions;
import org.thymeleaf.templatemode.TemplateMode;
import org.unbescape.html.HtmlEscape;

import com.abcijkxyz.domain.extrathyme.Remark;
import com.abcijkxyz.util.RemarkUtil;

/**
 * 备注国际化
 * 
 * @author root
 *
 */
public class RemarkForPositionAttributeTagProcessor extends AbstractAttributeTagProcessor {

	private static final String	ATTR_NAME	= "remarkforposition";
	private static final int	PRECEDENCE	= 12000;

	public RemarkForPositionAttributeTagProcessor(final String dialectPrefix) {
		super(TemplateMode.HTML, // This processor will apply only to HTML mode
				dialectPrefix, // Prefix to be applied to name for matching
				null, // No tag name: match any tag name
				false, // No prefix to be applied to tag name
				ATTR_NAME, // Name of the attribute that will be matched
				true, // Apply dialect prefix to attribute name
				PRECEDENCE, // Precedence (inside dialect's precedence)
				true); // Remove the matched attribute afterwards
	}

	@Override
	protected void doProcess(final ITemplateContext context, final IProcessableElementTag tag, final AttributeName attributeName, final String attributeValue, final IElementTagStructureHandler structureHandler) {

		final IEngineConfiguration configuration = context.getConfiguration();

		/*
		 * Obtain the Thymeleaf Standard Expression parser
		 */
		final IStandardExpressionParser parser = StandardExpressions.getExpressionParser(configuration);

		/*
		 * Parse the attribute value as a Thymeleaf Standard Expression
		 */
		final IStandardExpression expression = parser.parseExpression(context, attributeValue);

		/*
		 * Execute the expression just parsed
		 */
		final Integer position = (Integer) expression.execute(context);

		/*
		 * Obtain the remark corresponding to this position in the league table
		 */
		final Remark remark = RemarkUtil.getRemarkForPosition(position);

		/*
		 * If no remark is to be applied, just set an empty body to this tag
		 */
		if (remark == null) {
			structureHandler.setBody("", false); // false == 'non-processable'
			return;
		}

		/*
		 * Message should be internationalized, so we ask the engine to resolve the message 'remarks.{REMARK}' (e.g. 'remarks.RELEGATION'). No parameters are needed for this message.
		 *
		 * Also, we will specify to "use absent representation" so that, if this message entry didn't exist in our resource bundles, an absent-message label will be shown.
		 */
		final String i18nMessage = context.getMessage(RemarkForPositionAttributeTagProcessor.class, "remarks." + remark.toString(), new Object[0], true);

		/*
		 * Set the computed message as the body of the tag, HTML-escaped and non-processable (hence the 'false' argument)
		 */
		structureHandler.setBody(HtmlEscape.escapeHtml5(i18nMessage), false);

	}

}
